From Chibi Manga:

Ikenai Kiss O Shiyou
She fell in love with an extremely handsome mysterious man. He turns out to be a trainee teacher?!

Kinkyori Renai ~Bangaihen
A secret romance between teacher and student. The only person who can take off his glasses is me.

Pink No Idenshi Hanamitsu Shounen
She saw her Chemistry teacher Fugiki Sensei kissing a married teacher in the music room and the heroic battle begins!

Ecchii Houkago Kiken Na Katekyou
The extremely “popular” tutor is here to teach Yu but...?!

Mi Da Ra Choukyou
Yu-Sensei came as a tutor. I’ll do what ever it takes for him to fall for me!